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What extension?
KDE has too many buttons in the toolbar. Too many entries in the menu. I right-click and get presented with a context menu and it has too many options.
I believe it should make some assumptions and have more saner defaults.

I haven't heard about Lancelot.

Take away the stuff in the tool bar you don't like or take away the complete tool bar. But I don't think many program has to many tools in the tool bar as default today.

The context menu is dependent on the context but the plasma-desktop has 6 alternative. If I compare Kate and with the gnome equivalent Gedit, kate has 11 alternative in the context menu and gedit has 9 (booth without sub menus). I dont think that is a huge difference.

To add another start menu choose "Add widgets" in the context menu in plasma desktop and choose the application launcher filter to only see your application launchers you have installed.

Fun Fact:
In 3.2 we had LogOut and ShutDown in the menu
In 3.4 they dropped shutdown from the menu -> ShutDown extension
In 3.6 they added ShutDown to the menu but dropped LogOut (if single user machine) -> LogOut extension
In 3.8 they add/drop ?!? to/from the menu

Frame synchronization support for GTK+ and the Mutter compositor

What does it mean "Frame synchronization support for GTK+ and the Mutter compositor"? It's the function, which can prevent tearing like in compiz in Ubuntu? (i can't see any tearing in Unity 3D, despite Sandybridge will have no tearing prevention until linux 3.8)

What does it mean "Frame synchronization support for GTK+ and the Mutter compositor"? It's the function, which can prevent tearing like in compiz in Ubuntu? (i can't see any tearing in Unity 3D, despite Sandybridge will have no tearing prevention until linux 3.8)

Gtk and mutter would share the same paint clock.This will help with partially drawn windows by letting mutter know that the new frame isn't ready yet. It should also help improve performance.
The work would be somewhat akin to the what was done in Android 4.1with making all drawing components aware of the refresh clock.